Hello, I’m currently upgrading the electrical in my travel trailer and not sure how to build in the fusing at the Lithium Battery keeping wires to a minimum.
My Xantrex 2000 Watt XC Charger requires a 250A Fuse. My Victron 100/50 MPPT controller requires a 60A fuse at the battery. I have a 60A circuit breaker at the controller to enable on/off operation. Removing the 60A at the battery would leave the circuit through the battery disconnect unprotected. Future expansion would be a DC/DC Charger, which requires a 60A Fuse at battery as well.
The Blue Sea Surface 3 fuse Mounting Block (5196), is rated for 300A Total and 240A max per circuit. Rather than come off the Lithium Battery Post with multiple wires (individual circuits) how do I proceed.
I read that using a terminal mount MRBF on a Lithium Battery reduces the life expectancy as the heat generated from the MRBF effects the battery BMS.
May I add, from my research, I read that a Class T is the best option for Lithium and an MRBF is 2nd due to their reaction time. Have never seen Class T Fuse holders that will accept multiple fuses. As mentioned Blue Sea does have a MRBF Surface Mount for multiple fuses, but will not accommodate over 300A total or 240A per circuit.
A properly installed fuse -assuming it’s a good fuse, which lord knows there’s lots of MRBF-style chinese knockoffs- shouldn’t be generating any heat, so I’m curious the source of that statement.
Hello Justin, I read that in a review of a terminal mount (likely not a professional review at best). I’m not sure if all mounts are equal, but I tend to agree, don’t skimp on the fuse (no knockoffs here).
I have sent a note to the battery manufacturer for there take on battery mount fusing.
Still leaves me with the fact, I cannot find a tri (3) circuit mount that will take 400A plus and at least 250A per circuit.
Ah, okay yes that’s an issue for MRBFs; Bussmann, who manufactures the breakers and MRBF fuses and fuseholders often repackaged and sold under the Blue Sea brand, makes a single and a double-MRBF holder, and Blue Sea makes a multiple (I think triple or maybe quad) holder as well, but in all cases the maximum total rating is 300A, so that wouldn’t be a solution for you. @bcborn’s solution above, of individual MRBF holders and fuses mounted to an appropriately-rated busbar, though, is certainly viable!
